Macbook Pro (Q3 2012) not reading toshiba HDD 1TB

Hi,
I have the latest Macbook Pro 13" retina, and have a toshiba 1 TB hard drive. Earlier today, seemed to randomly eject itself, and now whenever I plug it back it in, it's not shown in the devices part of finder or on my desktop (all my HDD are shown there as well). Any help would be much appreciated, a lot of my important stuff is on this drive.
Thanks
M Cooke

Is this external HDD USB powered? If it is are you using a Y USB cable that connect to 2 USB ports? If not that is what you need to do.
Most all Mac notebooks do not put out enough power on any one USB port to fully power some of the USB powered external drives, Mostly on the larger GB/TB model drives. Also as the drive fills with data the drive has to work harder to access that data drawing more power from the USB port.
So if you don't have a Y USB cable run down to your local electronics store and buy one.
Then also do a SMC reset before you try to connect that drive even with the Y USB cable.

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